package cn.tedu._03vehicle.base.filters;

import cn.tedu._03vehicle.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = {"/v1/vehicle/*"})
public class LoginCheckFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.debug("初始化...");
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.debug("过滤器进行登录状态的校验");
        //doFilter是过滤器的核心方法:权限校验、网站限流、记录日志...
        //登录状态的校验;
        //HttpServletRequest是ServletRequest的子类,所以此处需要进行类型转换;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取会话对象;
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO != null){//登录状态
            //有此行代码,则代表放行;
            //无此行代码,代表不放行;
            filterChain.doFilter(request, response);
        }else {//未登录
            response.sendRedirect("/login.html");
        }
    }

    @Override
    public void destroy() {
        log.debug("销毁...");
        Filter.super.destroy();
    }
}
